Main thing I use the rover fo is expanding through a tunnel. I'll send it through to build a drone hub at the far end. Other things I do with it is repair malfunctioning drone hubs if they're not in overlap. Usually they are, but in the case of making a dome futher away, say if I had no near rare metals to my first base area I may have no choice until I can build my own hubs later.
Or managing an isolated concrete patch. If it's outside drone hub range, but I don't want to expand that way I'll use a rover until the concrete is used up then just demolish the extractors and bring the rover back.
